Malicious PDF — malware analysis report

Static analysis result for SHA-256 1403428d8ed5bd8e…

MALICIOUS

PDF

72.6 KB Created: 2021-08-27 22:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e0a334858a49cc34c26fd8e035b4cf21 SHA-1: 1aa8216c43cc451dad3163586d9a3a20d120c037 SHA-256: 1403428d8ed5bd8e07e0ae6bfe5ad89b742288be52ad8723aee2e7df5a78464c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://dobrasekacka.cz/userfiles/file/litakimejimilozubadok.pdf In PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/f707dcca5d1d90d3637b9656840dfb94/23541357846.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/vovidorepagabijujove.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/jbk12d9n0s114njuhdusef60e2/xowapomutapofaluwurodirir.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-23/20210623121510182707.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a514ae19---10265459996.pdfIn PDF document text
    • http://uco-kampen.com/media/files/jabelolake.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/41212929723.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/38062433244f1bc462d17d0a28141f67/pupadivuvuzizepo.pdfIn PDF document text
    • https://soechi.id/userfiles/file/laluzim.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/14229041052.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f49b03e4a---wewodokikebuwenokirido.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/60307015213.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32301725d---nakurotuvitu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/dikisulodurumitofujakig.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b432a309996---34179281457.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/7e9491db64a68d59407e95d6deec42c8/fegunonirevedega.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/92776346636.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111f57cb0990---kebapimupuziboximurapaxa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0d844cf8---57496797471.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0pjvr64du9m6uln8sl7kd16l91/7252635634.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4b0868ac9feda46d37c7e6e4d148bb26/54747986400.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/62400540353.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a424cd2969---13078996362.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/83989781243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=my+talking+angela+unlimited+coins+and+diamonds+no+surveyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4F 11080 bytes
SHA-256: 59afb5b13a3008d6469722124c05af078bfab85d0e4f11b99e284b7fbb2e1558
font_01_sfnt_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 14128 bytes
SHA-256: c9cf08b726efa87112ab0e6b3ac33675ed060c1ce2610e033915aaea617135c3
font_02_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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